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From "Bhallamudi Venkata Siva Kamesh (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4071) NPE while executing MRAppMaster shutdown hook
Date Thu, 05 Apr 2012 12:05:24 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bhallamudi Venkata Siva Kamesh updated MAPREDUCE-4071:

    Attachment: MAPREDUCE-4071-1.patch

Hi Robert,
 Thanks for looking into the patch. I totally ignored the unregister method in RMCommunicator.
I modified the patch and most of the changes are re-factoring like moving object instantiation
to init method etc...   If you feel, this is not the right way to fix this, please look into
this issue.
> NPE while executing MRAppMaster shutdown hook
> ---------------------------------------------
>                 Key: MAPREDUCE-4071
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4071
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.3, 2.0.0
>            Reporter: Bhallamudi Venkata Siva Kamesh
>            Assignee: Bhallamudi Venkata Siva Kamesh
>         Attachments: MAPREDUCE-4071-1.patch, MAPREDUCE-4071.patch
> While running the shutdown hook of MRAppMaster, hit NPE
> {noformat}
> Exception in thread "Thread-1" java.lang.NullPointerException
> 	at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$ContainerAllocatorRouter.setSignalled(MRAppMaster.java:668)
> 	at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$MRAppMasterShutdownHook.run(MRAppMaster.java:1004)
> {noformat}

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